Dyfyniad APA

United States. Weather Bureau. Daily synoptic series, historical weather maps. U.S. Weather Bureau.

Dyfyniad Arddull Chicago

United States. Weather Bureau. Daily Synoptic Series, Historical Weather Maps. Washington, D.C.: U.S. Weather Bureau.

Dyfyniad MLA

United States. Weather Bureau. Daily Synoptic Series, Historical Weather Maps. U.S. Weather Bureau.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.